The same could be said here. Why are Democrat-Republicans in power?
Merkel resides in power, and running for Chancellor again (election in seven weeks, but you wouldn’t even notice the election if you were in Germany)....and will very likely win the election. Reason? From the six-odd parties that will get 5-percent or more in the election...none really have any real competition to run against her.
Her right-of-center party (CDU) has been able to get unemployment at a low-point, and maneuvered the economy to the point that the government has excess money left in their hands (meaning more tax revenue coming in than anyone expected).
The pay-off via the EU to Turkey to hold back refugees (since spring of 2016) has paid off, and it appears that Germany is near the normal average (over a thirty-year period) of 250,000 immigrants/migrants.
Crime? A big deal, but then the CDU has hyped up the hiring at thousands of new police. But with the recruitment issues and training required....you won’t really see any effect with the added cops for two to four years.
The other parties? Her biggest competition is the SPD (left-of-center). They’ve fallen roughly ten points since early January, and they can’t seem to find any topic to attract voters. The Linke Party (the former Communist Party) at best, can only attract 9-percent of the vote. The Greens....at least nationally....have lost several points and are in conflict with each other. The AfD Party (anti-immigration) have maxed out with 7-percent of the public in polling. AfD hasn’t come up with some dynamic front-person, and their whole trend is based mostly on one single topic (immigration).
As hyped up as the American election was in Oct/Nov of 2016, and the French election back four months ago...no one much in Germany is hyped up on this election. No TV ads seen...the election is barely noted in nightly news, and I seriously doubt that you see more than 60-percent of the registered voters to show up on election day.
As for immigration and refugee policies...no one wants to touch them. Not at the EU level, and not at the German level. Go and ask German politicians to make a statement, and they just sit there and grin in silence.